S&P 500 Asset Class question

The Vanguard fund VINIX which is where my wife's 401K is invested in, basically is a S&P 500 index fund. My question is that it has an asset class of 'Blend'. Which is a mixture of Growth and Value Stocks.

Does anyone know the rough percentages of Growth and Value that the S&P 500 makes up.

Such as - Growth 80% - Value 20% ??